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ima: forbid write access to files with digital signatures

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This patch forbids write access to files with digital signatures, as they
are considered immutable.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Dmitry Kasatkin 2012-09-27 15:06:28 +03:00 committed by Mimi Zohar
parent ea1046d4c5
commit a175b8bb29
1 changed files with 5 additions and 2 deletions
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7
security/integrity/ima/ima_main.c
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@ -175,12 +175,12 @@ static int process_measurement(struct file *file, const char *filename,
if (!action) {
if (iint->flags & IMA_APPRAISED)
rc = iint->ima_status;
goto out;
goto out_digsig;
}
rc = ima_collect_measurement(iint, file);
if (rc != 0)
goto out;
goto out_digsig;
if (function != BPRM_CHECK)
pathname = ima_d_path(&file->f_path, &pathbuf);
@ -195,6 +195,9 @@ static int process_measurement(struct file *file, const char *filename,
if (action & IMA_AUDIT)
ima_audit_measurement(iint, pathname);
kfree(pathbuf);
out_digsig:
if ((mask & MAY_WRITE) && (iint->flags & IMA_DIGSIG))
rc = -EACCES;
out:
mutex_unlock(&inode->i_mutex);
if ((rc && must_appraise) && (ima_appraise & IMA_APPRAISE_ENFORCE))